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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 26 for “"Carbon Nanofiber"”.
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Mechanical Properties of Porous Magnesium Reinforced with Carbon Nanofiber
… the mechanical properties of porous magnesium. Carbon nanofiber is used as the reinforcement phase in this experimentation. Based on the experimental results, high porosity will compromise the Young's Modulus, the yield strength, and the ultimate compressive strength of porous magnesium. The …
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Development of Carbon Nanofiber Reinforced HNBR Composite for Sealing Applications
Carbon nanofiber(CNF) as a novel filler has been studied by researchers with huge enthusiasm owe to its special properties, like light weight, sustainability of large deformation, chemical stability, corrosion and fatigue resistance, vibration and noise reduction capability, especially in rubber …
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Preparation and Electrochemical Testing of Flexible Carbon Nanofiber Electrodes from Electrospinning
… conditions necessary for preparing flexible carbon nanofiber electrodes by electrospinning and to explore various applications for those electrodes. It was found that by varying only the relative humidity while electrospinning a poly(acrylonitrile) precursor, fragile or flexible freestanding …
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Electrospun carbon nanofiber electrodes decorated with palladium metal nanoparticles : fabrication and characterization
… a novel oxygen reduction electrode comprised of carbon nanofibers for use in polymer electrolyte membrane (PEM) fuel cells and metal-air batteries. The process involved electrospinning a solution of polymer (polyacrylonitrile), noble metal salt (palladium (II) acetate), and organic solvent (n,n- …
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Double-gated isolated vertically aligned carbon nanofiber field emission and field ionization arrays
… two issues, double-gated vertically aligned carbon nanofiber (VACNF) field emission and field ionization arrays have been developed. These arrays were characterized as field ionizers, which could produce molecular ions without severe fragmentation; and as field emitters, which act as an …
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A GAN-Augmented Machine Learning Framework for Predicting Raman Characteristics in Carbon Nanofiber Synthesis
… for predicting the structural quality of Carbon Nanofibers (CNFs) synthesized via Chemical Vapor Deposition (CVD). Building upon prior work employing Conditional Tabular GAN (CTGAN) for data augmentation and XGBoost for quality prediction, this thesis expands the methodology by …
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Analysis of Ionomer-coated Carbon Nanofiber for use in PEM Fuel Cell Catalyst Layers
… a novel electrode design based on ionomer-coated carbon nanofibers is proposed and studied. Governing equations for this design were established, and a mathematical model was created and solved using MATLAB to predict the performance of the new electrode design. A parametric study was performed to …
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Nano-filled Epoxy: Mechanical and Fire Behavior and Modeling of Nanocomposite Columns Under Fire
… used are montmorillonite nanoclays and carbon nanofibers. Three types of nanocomposites are manufactured: epoxy-clay, epoxy-carbon nanofiber, and epoxy-clay-carbon nanofiber nanocomposites. Fracture tests performed include Izod impact and fracture toughness, for the determination of the …
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Investigation of lithium-air battery discharge product formed on carbon nanotube and nanofiber electrodes
Carbon nanotubes have been actively investigated for integration in a wide variety of applications since their discovery over 20 years ago. Their myriad desirable material properties including exceptional mechanical strength, high thermal conductivities, large surface-to-volume ratios, and …
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Mechanical and interfacial properties of carbon nanofibers for polymer nanocomposites
… mechanical and failure response of vapor grown carbon nanofibers (VGCNFs) has been unexplored despite the large volume of carbon nanofiber composites fabricated today. Three grades of VGCNFs, namely as-fabricated, high temperature heat treated, and graphitized/surface oxidized, with average …
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Effect of carbon based nanoadditives on external gear pump performance
Abstract Effect of fine graphite flake, carbon nanotube, and carbon nanofiber additives on the efficiency of an external gear pump driving an ethanol-based closed hydraulic loop was investigated experimentally. A number of graphite, carbon nanotube (CNT) and carbon nanofiber (CNF) dispersions in …
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Development of New Cathodic Interlayers with Nano-Architectures for Lithium-Sulfur Batteries
… and were coupled with a sulfur/multi-walled carbon nanotube (S/MWCNT) composite cathode. The cell with this configuration showed a good cycle life at a high current rate ascribed to (a) a strong interaction between the polysulfides and ZnO nanowires grown on conductive substrates; (b) fast …
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Current limiters based on silicon pillar un-gated FET for field emission application
… individually connected in series with silicon or carbon nanofiber (CNF) emission tip. The transistors were designed as high aspect ratio silicon pillars in order to achieve velocity saturation of carriers and obtain current source-like characteristics. Device and process simulations were initially …
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Low platinum loading electrospun electrodes for proton exchange membrane fuel cells
… performed to evaluate the utility of electrospun carbon nanofiber supports for sputtered platinum catalyst in proton exchange membrane fuel cells. The performance of the sputtered nanofiber supports was similar to that of sputtered commercial gas diffusion layers in single cell fuel cell tests. …
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Characterization of Mechanical Properties at the Micro/Nano Scale: Stiction Failure of MEMS, High-Frequency Michelson Interferometry and Carbon NanoFibers
… also responsible for the adhesion in nonwoven carbon nanofiber networks. Experimental and modeling results are presented for the mechanical and electrical properties of nonwoven (random entanglements) of carbon nanofibers under relatively low and high-loads, both in tensions and compression. It …
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Development of nanoscale biosensors for cancer related proteases and blood-borne pathogens based on electrochemical and optical methods
… activity of proteases using vertically aligned carbon nanofiber (VACNF) NEAs. VACNFs were grown on conductive substrates and encapsulated in SiO₂ matrix. After polishing and plasma etching, controlled VACNF tips are exposed to form an embedded NEA. Tetrapeptides specific to cancer-mediated …
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Photoanode and counter electrode modification for more efficient dye sensitized solar cells
… electrode with a novel vertically aligned carbon nanofiber (VACNF) electrode. A large specific electrode surface area (~125 cm[superscript]2 over 1 cm[superscript]2 geometric area) was obtained by using VACNFs. The relatively high surface area, good electric conductivity and the large …
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Ru,Rh,Ru Supramolecular Photocatalysts within Nafion® Membranes: Ion-exchange, Photoelectrolysis and Electron Transfer Processes
… electrodes and materials made from electrospun carbon mats. The [{(bpy)2Ru(dpp)}2RhBr2] 5+ complexes behave as photocatalytic hydrogen production catalysts in the Nafion® membrane. Furthermore, a second bulk photoelectrolysis experiment with the Nafion®/[{(bpy)2Ru(dpp)}2RhBr2] 5+/FTO electrodes …
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Development of Magnetorheological Elastomer System for Adaptive Vibration Isolation
… (MR) effect under different loading conditions. Carbonyl iron, medium (Tap silicone and Natural rubber), and additives (Carbon black and Carbon nanofibers) mixed MRE's were fabricated under applied magnetic field of 1.2 Tesla. Scanning electron Microscope (SEM) pictures of the MREs showed the …
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Fundamental understanding and materials design approaches for lithium-oxygen electrochemical energy storage
… devices: (1) oxygen functionalization of carbon surfaces for fast surface Li storage, and (2) bulk oxygen reduction and Li storage in Li-air batteries with a theoretical cell-level gravimetric energy up to 4 times higher than Li-ion batteries. First, we study the charge storage mechanisms …
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